Engine-valve.



G.'F. GILLETTE.

ENGINE VALVE.

APPLICATION FILED APR.6, 1914.

1, 1 1 1,827. Patented Sept. 29, 1914.

2 SHEETS-SHEET 1.

h (V A: E /t f h I J {y} H I A lfll r H H! t H G l 1.5 B a I I w wfi Arron/VHS G. r. GILLETTE.

ENGINE VALVE.

APPLICATION FILED APR.6. 1914.

Patentd Sept. 29, 1914.

isnmTs-srinm 2.

INVENTOR Gemgae/Y' 52226656 F ATTORNEYS tili GEORGE F. GILLETTE, OFDETROIT, MICHIGAN.

ENGINE-VALVE.

Specification of Letters Patent. Patented Sept. 29, 1914.

Application filed April 6, 1914. Serial No. 829,930.

To all whom it may concern:

Be it known that l, Gnonen F. GILLETTE, a citizen of the United States of America, residing at Detroit, in thecounty of Wayne and Stateof Michigan, have invented certain new and useful Improvements in Engine-Valvcs, of which the following is a specification, reference being had therein to the accompanying drawings. v

The invention relates to engine valves and more particularlyto valves of a gymtory type.

It is the object of the invention, first, to obtain a construction in which a. perfect seal is maintained between the valve and its seat; second, to provide. for a relatively large port area; third, to protect the valve and its seat from. the internal heat of the engine; and further, to obtain various specific advantages as hereinafter set forth.

In the drawings: Figure 1 is a longitudinal section through a portion of a multicylinder explosion engine to which my valve is applied; Fig. 2 is a plan View thereof; Fig. 3 is a plan view of the valve; and Fig. i is a diagrammatic plan view showing a modified arrangement of the cooperating ports in'the valve and seat.

A are the cylinders of a multr-cylinder explosion engine; B the pistons therein;

and C a detachable head for closing the upper ends of thecylinders. Thishead C is provided with a that under face D forming a seat or slide for a gyratory valve plate E. The latter is of a. length to ex tend over all of the cylinders and at its opposite ends is connected with suitable means for imparting the gyratory movement, such as cranks F upon rotary ver tical shafts G suitably driven from the engine crank shaft.

The valve F is suitably ported to coiip erate with ports in the head C connnunicat ing with the inletand exhaust passages.

As shown in Fig. 2, the exhaust passage H is arranged to extend longitudinally on one side of the head'Q, connecting with each of the exhaust ports I 1: etc, while the inlet passage J "is arranged upon the opposite side of the head and has lateral extensions connecting with each of the in let ports K K etc. The s ace within the head intermediate these in ct and exhaust passages forms a watenjacket, by means of which the temperature of the valve face is suitably reduced. I

I I To secure efliciency in. the operation of the engine it 1s essential to maintain a perfect seal between the valve and its seat. This I insure-by providing each of the cylinders A'with a floating head L arranged between the clearance space in the cylinder" and the valve-plate Each of the heads L is preferably fitted within a counter-bore M-in the end portion of the cylinder and is packed by peripheral rings N. By reason of the counter-bore the ports formed in the floating heads L, and which register with the ports in the valve seat C, may be made of greater area than would be the case if the floating heads were placed in the cylinder proper.

With the construction as thus far described in operation, the gyratory moveinent imparted to the valve plate-E will cause ports 0 thereof to pass through an orbit in which they are successively regthe upper flat face of the floating head L.

This head being subjected on its lower face to the pressure within the engine cylinder,

' will be maintained in sealing contact with the valve plate and will also hold the lat ter in sealing contact with the face D of the head. Thus a perfect seal will be maintained without regard to the degree of pressure that is developed in the engine cylinders'.

' To obtain the maximum port area together with a quick opening and closing movement, the 'co'c'aperating ports in the valve and its seat are preferably of peculiar formation. As illnstrated in Fig. 8, the ports inthe valve are provided with oppositelyangling sides which are symmetrical with respect to a central line and in the several cylinders these central lines are in different angular relation. Thus with the port 0, thc central line is parallel to the common plane of the 7 cylinders; with the port 0, the central line is perpendicular to this plane; and the ports O and U have their central lines respectivel in the planes of the ports 0 and 0", but with the angling sides of the ports oppositely facing. The cooperating ports I and Kin the valve seat have their adjacent edgesin an angular relationsimilar to that between theedges of the port 0, so that the latter portwill have its opposite edges parallel to the edges of 0 (angular intake period angular exhaust period portions of the slot are equal to the segments included by said arcs and chords. As a consequence where the angle of exhaust is greater than the angle of inlet, the port will be correspondingly wider. The requisite port area is obtained by selecting the radius of the are.

By reason of the fact that the movement of the valve plate is gyratory and that each point in this plate traverses a circular orbit, the edges of the port in the valve plate always remain parallel to the edges of the ports in the valve seat. Furthermore, the movement is such that when the valve port passes into or out of, registration with the seat port, it is traveling at right angles to the parallel edges of said ports, which causes the quick opening and closing. On the other hand, the valve port as it approaches full registration with the seat port is approximating a movement parallel to the edges of the ports which causes a relatively long full open period. Expressed in other words, the arrangement is such that the maximum length of open period is maintained while the opening and closing'movements are relatively quick. The seat ports are of greater length than the valve ports in order to maintain this long period of full opening, but the width of these ports may be the same as that of the corresponding valve ports. i

What I claim as my invention is 1. The combination with an engine cylinder having a flat ported valve face, of a valve having a gyratory movement over said face, and a floating head bearing against said valve for maintaining the seal between the same and said valve face.

2. The combination with an engine cylinder, of a floating head in said cylinder, 21 valve seat, and a valve intermediate said seat and floating head.

3. The combination with an engine cylinder, of a floating head engaging the 'end of said cylinder, a stationary head having a flat valve face or seat, and a valve interof angular slots having parallel edges P P P P with an imperforate V-shaped portion P therebetween. The formula for obtaining the proper included angle between these ports is as follows:

angle of gap,

mediate said stationary head and floating head.

4. The combination with an engine cylinder, of a floating head at the end of said cylinder, a stationary ported head having inlet and exhaust passages formed therein, and a valve arranged intermediate said floating head and stationary head.

5. The combination with an engine cylinder having a counter-bored end, of a floating head arranged in the counter-bore of said cylinder, a stationary head having a flat valve face, and a valve intermediate said stationary head and Heating head.

6. The combination of an engine cylinder, having a counter-bored end, a floating head engaging said counter-bore and provided with eripheral packing rings, a stationary por ed head having a flat face, and a valve intermediate said stationary head andfloating head.

7. The combination of an engine cylinder having a counter-bored end, a detachable head for closing said cylinder provided with a flat valve seat, a gyratory valve engaging said valve seat, and a floating head in the counter-bore of said cylinder bearing against said valve.

8. In a multi-eylinder engine, the combination with a plurality of cylinders, each having a counter-bored end, of a common head for said cylinders provided withaflat valve seat, a gyratory valve engaging said seat, and floating heads in the counter-bores of the respective cylinders for hearing against said valve.

9. In an explosion engine, the combination with an engine cylinder, of a floating head engaging the end portion of said cylinder, a stationary head having a flat valve seat, inlet and exhaust'passages and a water-Ja'cket intermediate said passages, and a gyratory valve intermediate said floating head and stationary head.

.10.-In a multi-cylinder engine, the combination with a plurality of cylinders havmg ported valve seats, of a common gyratory valve for controlling the ports in said seats, the cooperating valve and ports for each, of sand cylinders being symmetrical with respect to the direction of movement of the valve in the corresponding phase of the cycle.

11. In an explosion engine, the combination with the valve seat, of a gyratory valve,

said valve being provided with a port in the form of an angle slot and said seat having inlet and exhaust ports parallel respectively with the angling portionsof said valve port.

12. In an explosion engine, the combination with a valve seat, of a gyratory valve having inlet and exhaust ports, the edges of each port being parallel and in angular relation to those of the other port, the angle being such that each port is moving substantially perpendicular to its edge when 0 angular intake period+ angular exhaust period passing into and out of registration with the cooperating seat port, and is moving substantially parallel to its edge when in full registration with its cooperating port.

18. In an explosion engine, the combination with the valve seat, of a gyratory valve, said seat and valve having inlet and exhaust ports respectively having parallel edges and 1n an angular relation to each other, the included angle being determined by the following formula:

+angular period between the 2 closing of the exhaust port and the opening of the inlet port.

In testimony whereof I afiix my signature in presence of two witnesses.

Witnesses:

JAM S P. BARRY, ADELAIDE T. ADAMS.

GEORGE F. GILLETTE. 

